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Theory of Machine

Theory of Machine
Elements of pairs held together mechanically is known as

Closed pair
Mechanical pair
Rolling pair
Open pair

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Theory of Machine
The stress induced in a body will be shear stress, when it is subjected to

Transverse vibrations
Longitudinal vibrations
Torsional vibrations
None of these

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Theory of Machine
Creep in belt drive is due to

Material of the belt
Uneven extensions and contractions due to varying tension
Larger size of the driver pulley
Material of the pulley

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Theory of Machine
When there is a reduction in amplitude over every cycle of vibration, then the body is said to have

Forced vibration
Free vibration
Damped vibration
Under damped vibration

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Theory of Machine
In gramophones for adjusting the speed of the turntable, the following type of governor is commonly employed

Hartung governor
Wilson Hartnell governor
Pickering governor
Inertia governor

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Theory of Machine
A torsional system with discs of moment of inertia I₁ and I₂ as shown in the below figure, is gear driven such that the ratio of speed of shaft B to shaft A is 'G'. Neglecting the inertia of gears, the equivalent inertia of disc on shaft B at the speed of shaft A is equal to

I₂/G²
G.I₂
G².I₂
I₂/G

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